Gujarat ATS is questioning local suspects and informers in a bid to gather leads about those behind the July 13 serial blasts in Mumbai.
"Questioning (of suspects and informers) has been on since the blasts took place in Mumbai," a senior ATS official said on Wednesday.
"We are also questioning some of Indian Mujahideen members arrested in connection with the July 2008 serial blasts in Ahmedabad," he said.
They include Danish Riyaz, of Ranchi, who was arrested last month from Vadodara.
A Gujarat ATS team, along with a squad from the Ahmedabad Crime Branch, had gone to Mumbai post the bombings, and collected some clues from police there which are being verified, the officer said.
There has also been sharing of information between the Maharashtra and Gujarat ATS, he said.
Maharashtra ATS had on Tuesday said terrorists responsible for the latest terror attack on India's financial capital could have strong links with Gujarat and Kolkata.
Meanwhile, senior police officers of Gujarat have been conducting meetings after the Mumbai blasts and assessing intelligence reports by the state and Central agencies, sources close to the development said.
Gujarat has been on a high alert ever since the triple blasts claimed 20 lives and injured nearly 130.
On July 26, 2008, a series of bomb blasts had rocked Ahmedabad killing 57 people. A couple of days later over two dozen bombs were recovered from Surat.